Clinking on your fav music player should open it up and connect to the live stream. Or, use the embedded player at the bottom. Simples.
Winamp
Windows media player
Real player
Quicktime
An embedded player can also be found on the new 200mph radio website HERE
Testing has thrown up a few problems with IE8, so here are the direct links, if none of the above work (remember, you can only listen live when there is a live show being broadcast)
Winamp
http://shoutcast.internet-radio.org.uk/tunein.php/thetreblet/playlist.pls
Windows Media Player
http://shoutcast.internet-radio.org.uk/tunein.php/thetreblet/playlist.asx
Real Player
http://shoutcast.internet-radio.org.uk/tunein.php/thetreblet/playlist.ram
Quicktime
http://shoutcast.internet-radio.org.uk/tunein.php/thetreblet/playlist.qtl
Winamp
http://shoutcast.internet-radio.org.uk/tunein.php/thetreblet/playlist.pls
Windows Media Player
http://shoutcast.internet-radio.org.uk/tunein.php/thetreblet/playlist.asx
Real Player
http://shoutcast.internet-radio.org.uk/tunein.php/thetreblet/playlist.ram
Quicktime
http://shoutcast.internet-radio.org.uk/tunein.php/thetreblet/playlist.qtl